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 ###Instrução: Se o playoff for 17, qual é o número do campeonato da AFC?
 ###Tabelas: CREATE TABLE 2012_ladder (2012_ladder_id AUTO_INCREMENT PRIMARY KEY, Peel VARCHAR, Wins INT, Byes INT, Losses INT, Draws INT, Against INT) CREATE TABLE imported (imported_id AUTO_INCREMENT PRIMARY KEY, Model VARCHAR, Build year VARCHAR, Top speed (In operation) （km/h） INT, Power output （kW） VARCHAR, Total production INT) CREATE TABLE year_by_year_performance (year_by_year_performance_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Competition VARCHAR, Round VARCHAR, Played VARCHAR, Drew VARCHAR, Lost VARCHAR) CREATE TABLE total_playoff_berths_while_in_the_afl_afc_east (total_playoff_berths_while_in_the_afl_afc_east_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Division Titles INT, Playoff Berths INT, AFL Titles INT, AFC Championships INT, Super Bowl Championships INT) CREATE TABLE tallest_buildings_and_structures (tallest_buildings_and_structures_id AUTO_INCREMENT PRIMARY KEY, Rank VARCHAR, Name VARCHAR, Height metres / ft VARCHAR, Floors VARCHAR, Year INT)  
SELECT AFC Championships FROM total_playoff_berths_while_in_the_afl_afc_east WHERE Playoff Berths = 17